How to safety delete custom fields in JIRA?

[Jerrin Mathew]

I'm trying to determine the best approach in determining whether a custom field is inactive. My thoughts is if a custom field is not associated to any screen, it is inactive.

Is there anything else I should check for before proceeding to deleting the custom field? 

[Nic Brough -Adaptavist-]

Are you running Jira as a service?

Is anything else running on the machine?

On a based-on-experience rough idea, I wouldn't even bother running a production Jira installation on less than 1Gb of memory, and even that's the minimum for a small install (up to 25 users). Rather than trying to squeeze your services, you might find it quicker/cheaper/easier to get more memory for the box.

[Gustavo Silva]

I have confluence running as well in the same server, and few other applications (Jira running as service). I could buy more memory for my cloud server, but it's going to cost me 100$ each one. I only have 6 users. Do you think if I get 2GB plus the Jira server will use all these 2GB? Or it might get stable at 1gb?